資源描述：
《外文翻譯---離子滲氮對馬氏體時(shí)效鋼微觀結(jié)構(gòu)和性能的影響》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在工程資料-天天文庫。
1、附錄一英文翻譯原文EFFECTofIONNITRIDINGONtheMICROSTRUCTUREANDPROPERTIESofMARAGINGSTEEL(250GRADE)KishoraShettyS.Kumarb,P.RaghothamaRao;RegionalCentreforMilitaryAirworthiness(FoundryandForge),CEMILAC,DRDO,Bangalore-560037,IndiaDepartmentofMaterialsEngineering,IndianInstituteofScie
2、nce,Bangalore-560012,IndiaReceived25June2008.Accepted28November2008.Availableonline10December2008AbstractInthepresentinvestigation,ionnitridingofMaragingsteel(250grade)hasbeencarriedoutatthreedifferenttemperaturesi.e.,at435℃,450℃and465℃for10?hdurationinordertoachievego
3、odwearresistancealongwithhighstrengthrequiredfortheslattrackcomponentofaircraft.Themicrostructureofthebasematerialandthenitridedlayerwasexaminedbyopticalandscanningelectronmicroscope,andvariousphasespresentweredeterminedbyX-raydiffraction.Variousproperties,suchas,hardn
4、ess,casedepth,tensile,impact,fatiguepropertiesandcorrosionresistancewereinvestigatedforbothun-nitridedandion-nitridedmaterials.ItisobservedthatthemicrostructureofthecorematerialremainsunalteredandFe4Nisformedinthehardenedsurfacelayerafterionnitridingatallthethreetemper
5、aturesemployed.Surfacehardnessincreasessubstantiallyafterionnitriding.Surfacehardnessremainsalmostthesamebutcasedepthincreaseswiththeincreaseinionnitridingtemperatureduetogreaterdiffusivityathighertemperatures.Tensilestrength,fatiguestrengthandcorrosionresistanceareimp
6、rovedbutductilityandenergyabsorbedinimpacttestdecreaseonionnitriding.Theseresultsareexplainedonthebasisofmicrostructuralobservations.Thepropertiesobtainedafterionnitridingat450?°Cfor10?harefoundtobeoptimumwhencomparedtotheothertwoionnitridingtemperatures.Keywords：Ionni
7、triding;Maragingsteel;Microstructure;Casedepth;Tensileproperties;Fatigueproperties1.IntroductionSurfaceengineeringmeans‘engineeringthesurface’ofamaterialorcomponenttoconfersurfaceproperties,whicharedifferentfromthebulkpropertiesofthebasematerial[1].Thepurposemaybetored
8、ucewear,minimizecorrosion,increasefatigueresistance,reducefrictionalenergylosses,actasadiffusionbarrier,providetherma
